Populações de aranhas errantes do gênero Ctenus em fragmentos florestais na Amazônia Central

Mestre, Luiz Augusto Macedo; Gasnier, Thierry R.

doi:10.1590/s0044-59672008000100018

Cited by 16 publications

(12 citation statements)

References 23 publications

(28 reference statements)

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“…MESTRE & GASNIER (2008), in a study conducted two years earlier in some of the same sites studied by REGO et al (2005REGO et al ( , 2007, detected an impressive seasonal variation in the abundance of all four Ctenus species. Furthermore, they did not detect any significant differences in abundance when comparing species individual abundances between "small" (1 and 10 ha) and "large" (100 ha and continuous forest) forest areas (MESTRE & GASNIER 2008).…”

Section: Spidersmentioning

confidence: 93%

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Arthropod responses to the experimental isolation of Amazonian forest fragments

Vasconcelos¹,

Bruna²

2012

Zoologia (Curitiba)

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Section: Spidersmentioning

confidence: 93%

“…II). Most of these studies evaluated community level responses, such as changes in species richness and composition, but some focused on population level responses to fragmentation (e.g., MESTRE & GASNIER 2008). All but one of the studies evaluated area effects (Tab.…”

Section: Arthropod Groups and Effects Studiedmentioning

confidence: 99%

Arthropod responses to the experimental isolation of Amazonian forest fragments

Vasconcelos¹,

Bruna²

2012

Zoologia (Curitiba)

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“…Gleaning animal‐eating bats, which formerly occurred at low abundances in fragments (Sampaio, ) and young regrowth (Bobrowiec & Gribel, ), have increased over the past 10–15 years as the surrounding regrowth has expanded and matured (Meyer et al, ; Rocha, ; Rocha et al, ). A number of other species, including certain forest spiders (Mestre & Gasnier, ), dung beetles (Quintero & Roslin, ), euglossine bees (Becker, Moure & Peralta, ) and monkeys such as red howlers Alouatta seniculus , bearded sakis Chiropotes satanas and brown capuchins Cebus apella (Boyle & Smith, 2010 b ), have also recolonized some of the fragments.…”

Section: Forest Isolation and The Matrixmentioning

confidence: 99%

An Amazonian rainforest and its fragments as a laboratory of global change

et al. 2017

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We synthesize findings from one of the world's largest and longest-running experimental investigations, the Biological Dynamics of Forest Fragments Project (BDFFP). Spanning an area of ∼1000 km in central Amazonia, the BDFFP was initially designed to evaluate the effects of fragment area on rainforest biodiversity and ecological processes. However, over its 38-year history to date the project has far transcended its original mission, and now focuses more broadly on landscape dynamics, forest regeneration, regional- and global-change phenomena, and their potential interactions and implications for Amazonian forest conservation. The project has yielded a wealth of insights into the ecological and environmental changes in fragmented forests. For instance, many rainforest species are naturally rare and hence are either missing entirely from many fragments or so sparsely represented as to have little chance of long-term survival. Additionally, edge effects are a prominent driver of fragment dynamics, strongly affecting forest microclimate, tree mortality, carbon storage and a diversity of fauna. Even within our controlled study area, the landscape has been highly dynamic: for example, the matrix of vegetation surrounding fragments has changed markedly over time, succeeding from large cattle pastures or forest clearcuts to secondary regrowth forest. This, in turn, has influenced the dynamics of plant and animal communities and their trajectories of change over time. In general, fauna and flora have responded differently to fragmentation: the most locally extinction-prone animal species are those that have both large area requirements and low tolerance of the modified habitats surrounding fragments, whereas the most vulnerable plants are those that respond poorly to edge effects or chronic forest disturbances, and that rely on vulnerable animals for seed dispersal or pollination. Relative to intact forests, most fragments are hyperdynamic, with unstable or fluctuating populations of species in response to a variety of external vicissitudes. Rare weather events such as droughts, windstorms and floods have had strong impacts on fragments and left lasting legacies of change. Both forest fragments and the intact forests in our study area appear to be influenced by larger-scale environmental drivers operating at regional or global scales. These drivers are apparently increasing forest productivity and have led to concerted, widespread increases in forest dynamics and plant growth, shifts in tree-community composition, and increases in liana (woody vine) abundance. Such large-scale drivers are likely to interact synergistically with habitat fragmentation, exacerbating its effects for some species and ecological phenomena. Hence, the impacts of fragmentation on Amazonian biodiversity and ecosystem processes appear to be a consequence not only of local site features but also of broader changes occurring at landscape, regional and even global scales.

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“…Varios autores han mostrado que la fragmentación genera cambios en el tamaño poblacional, la riqueza de especies y la distribución de los individuos (Bolger et al, 2000;Venticinque & Fowler, 2001;Mestre & Gasnier, 2008;González et al, 2011;Stefani & Del-Claro, 2014). De esa manera, un grupo taxonómico como el de las arañas, que está fuerte y predeciblemente influenciado por el tipo de hábitat y los patrones en el uso del suelo (Uetz, 1975;Weeks & Holtzer, 2000;Grill et al, 2005;Jansen et al, 2013), es relevante para evaluar estos cambios ambientales.…”

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Efectos del disturbio antrópico sobre las poblaciones de Leprolochus birabeni (Araneae, Zodariidae) en el Chaco Seco del noroeste de Argentina

Torres

González-Reyes

Rodriguez-Artigas

et al. 2016

Iheringia, Sér. Zool.

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RESUMEN Se conoce poco sobre la biología y la ecología de la especie mirmecófaga Leprolochus birabeni Mello-Leitão, 1942 (Zodariidae), el único representante de este género en la Argentina. Esta especie es típica de ambientes áridos del norte del país, y su estudio en el Chaco Seco es relevante, por ser una ecorregión altamente perturbada con uno de los pocos bosques subtropicales secos del mundo. El objetivo de este trabajo es estudiar la demografía de la especie teniendo en cuenta su variación estacional en ambientes nativos, y sí la ganadería y la agricultura, dos de las actividades antropogénicas más comunes de la ecorregión Chaco Seco en la provincia de Salta (Argentina) producen cambios en sus poblaciones. Se consideraron tres tipos de ambientes: nativo (NA); afectados por el ganado vacuno y caprino (NP); y afectados por la agricultura (NC). Este último correspondió a parches de vegetación nativa en medio de una matriz agrícola. En cada tipo de ambiente se consideraron tres sitios de muestreo donde se realizaron muestreos estacionales utilizando trampas de caída durante el otoño, invierno y primavera de 2006 y el verano de 2007. Se recolectaron 549 ejemplares de L. birabeni , siendo la mayoría juveniles con el 64,12% de la abundancia total, seguidos por machos (26,41%) y hembras (9,47%). A nivel de paisaje, la primavera presentó el mayor número de individuos, llegando al 44,99% de la abundancia total; mientras que el otoño mostró el porcentaje más bajo (7,83%). El incremento de los juveniles durante el invierno podría indicar una adaptación de los estadios de desarrollo a las condiciones ambientales. El mismo patrón se observó en ambientes NA y NC, pero no en los NP. Estos últimos mostraron una disminución en la abundancia de adultos a lo largo del año; mientras que las poblaciones NC mostraron un incremento en la abundancia de los machos durante la primavera, con una fuerte reducción de las hembras y los juveniles durante todo el año. La abundancia de L. birabeni en ambientes NA fue mayor (41,06% de la abundancia total), siendo los valores mínimos registrados en NC (24,67%). Las dos actividades antropogénicas más comunes que afectan al Chaco Seco de la provincia de Salta modifican tanto los cambios estacionales como la representación de las diferentes etapas de desarrollo y sexos de las poblaciones nativas de L. birabeni , siendo la modificación de los ambientes nativos por la agricultura, el factor más perjudicial.

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Populações de aranhas errantes do gênero Ctenus em fragmentos florestais na Amazônia Central

Cited by 16 publications

References 23 publications

Arthropod responses to the experimental isolation of Amazonian forest fragments

Arthropod responses to the experimental isolation of Amazonian forest fragments

An Amazonian rainforest and its fragments as a laboratory of global change

Efectos del disturbio antrópico sobre las poblaciones de Leprolochus birabeni (Araneae, Zodariidae) en el Chaco Seco del noroeste de Argentina

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